Prior to launching the installation process, note that the skin root directory must contain the info.xml file and at least one .css file.
To install the skin you have created to Plesk Sitebuilder:
<sb-root>/htdocs/skins/ directory on the Plesk Sitebuilder server.# sb_config --update_skins
After the installation process is completed, the newly installed skin appears in the list of available skins on the Plesk Sitebuilder Administrator Panel (Server > Skins).